git: mqueues: Add sysctl for max message count in a queue.

[Stathis Kamperis <beket@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 8658b626fa4839231ea8f05fc9349eb29777ab1d
Author: Stathis Kamperis <beket@dragonflybsd.org>
Date:   Sat Jan 23 13:29:53 2010 +0200

    mqueues: Add sysctl for max message count in a queue.
    
    A user could set mq_maxmsg (the maximal number of messages in a queue)
    to a huge value on mq_open(O_CREAT) and later use up all kernel memory
    by abusing mq_send(), resulting in a denial of service attack.
    
    Add a sysctl'able limit which defaults to 16*mq_def_maxmsg.
    
    Taken from NetBSD.

Summary of changes:
 sys/kern/sys_mqueue.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8658b626fa4839231ea8f05fc9349eb29777ab1d


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